Friction-clutch.



A, H. GLEASN.

FRIGTION CLUTCH.

APPLICATION FILED JAN@ 1914.

1,1 17,182. Patented Nov.17,194.

A. H. GLEASDN.

mmm CLUTCH.

- "PLIOATION FILED JAN. 5, N14. l

ps 131 l 918g vPatented NW1?, 1.91.4y

2 SHEETS-SHEET 2.

ilri lTElQ PATENT V atentar n. erin-ascia or xnnosna. Wisconsin.

FR'ICTGN-CLUTCH.

Specification of Letters atentl Patented Nev. inicie.,

Application filed January 5, 191e. Serial No. 510,386.

My invention relates to improvements in friction clutches and has for its object the production of a clutch of this character which will be of durable and economical construction and efficient in use.

Othel1 objects will appear hereinafter.

The inventionconsists in the combinations and arrangements of parts hereinafter described and claimed The invention will be b'est understood by 4reference to the accompanying drawings forming a part of this specification', and in which, Y Figure 1 is a substantially central longi? tudinal section of a friction clutch embodyingI my invention, Fig. 2 is a' sectional end view thereof, Figs. 3 and 4 are transverse sections taken on substantially lines and y-y respectively of Fig. 1, and Fig. 5 is a fragmentary detail'section taken on substantially line z-a of Fig. 3.x

The preferred form of construction as illustrated in the drawings comprises a hollow circular member. 1\which`,v\vhen in use,

is secured b v a set-screw2 to the driving or power shaft Arranged within the member 1 adjacent the open 'end thereof is a collar 4 secured in positionby means of screws 4. Loosely mounted in .the collar 4- is va cylindrical member 5 Which, When in use, is connectedl with. the t. driven shaft 6, the latter being shown'in a stationary casmg or housing 7. Provided at' the pcriphery of the member 5 is an annular flange 8 which engages against the corresponding end of the collana so as to hold said partsy against relative longitudinal movement' in one direction.

Arranged Within the member l'upon the inner side of the membe y5 is a split eXpansionband9 adapted, wheii expanded. to frictionally engage with a circularfriction surface 10 constituted at the inner side of member l in order to operatively connect the members 1 and 5 and hence the shafts 3 and 6. The expansion band 9 is secured to the member 5 bymeans of a bolt ll which passes through said band midway the ends thereof, bolts 12 passing through the porn tions of said band, midway the bolt 11 and the extremities of said band, the bolts 12, however, ,engaging with elongated 'slots 13 60 provided` in said band which a'ordsclearance for said bolts inorderfto. permit of flexing ofthev ends ofsaid band in the expansion and contraction thereof, as will be readily understooduA The bolts 12 serve 55 to relieve. the burden of bolts 1l in the con' nection o f the band 9 withl the member 5 it being clear that without the employment of boltsv 12, in operation, a tremendous strain would be placed upon the single bolt 70. 11 when the expansion band was expanded to connect the shafts 3 and 7.' Vhen the shafts 3 and 7 are connected through the expansion of band 9, thestrain upon the laty ter is longitudinally thereof s o that the elongation of the slots 13 transversely of the band permits of free Aflexing of the ends of the band Vwithout interfering with the bolts 12 performing'their function of conf .necting the band with the member 5.- Said band 9 is of a diameter greater than .that of the member 5, beingA just slightly less than the internal diameterof member 1, and sol that said band engages against the inner end4 of collar 4 so as to serve in conjunction with 85 the flange 8 to hold the parts 1 and 5 against relativelongitudinal movement.

Outward fiexin'g'of the ends ofthe band 0in order to effect expansion of the latter is secured through the medium of levers 14 90 which are fulcrumed intermediate their ends at l5v tov theV terminals of said band The outer ends cfs-aid levers engage with a fulwhich will serve as a fulcrumtherefor and thereby effect outward 'flexing ofthe ends of 100 band 9. The fulcrum member 16v is provided at one side with a screw 18 for engagement with one of said levers 14,*said screw beingvprovided in order to permit of adjustment so as to compensate for wear and maintain the `relative position of le-v vers 14. Coperating with the inner ends of levers 14 is a roller 19 mounted in bear- 'ings provided in the. inner ends of pins 20 which are slidably mounted in the member 11o 5, the outer ends of said pins being fixed in a shifting collar 21 which is loosely the friction surface y10.

mounted so as to rotate in unison withv The roller 19 is 19 into and out of registration with levers.

14 is edected by means of a split fork or lever 22 which coperates With shifting collar 21,l said fork being fulcrumed at 23 to a bracket 24 which is fixed by means of setscrew 25 to the shaft casing 7, blocks 26 provided atv the opposite sides 'of fork 22 loosely engaging the channel of collar 21 at opposite sides thereof. tvVith this arrange.

ment then, it will be seen that when the. lever 22 is atits left hand terminal of oscillation, the roller 19 will be out of registration with levers 111, in which event the band 9 will be in contracted -condition and hence the parts 1 and 5 permitted to run free and independent of each other. `When it is desired to operatively connect said parts, it is only required to rock the fork 22 to the right, this movement causing the -roller 19 to be forced to position between the inner ends of lever 14, spreading the latter and hence effecting outward flexing of the ends of band 9 into frictional engagement with The construction is such that a chamberis formed at the inner end of the clutch member 1 for the accommodation of a lubricant for effecting lubrication of the various parts of the mechanism. This chamber which is completely inclosed contains all of -tlio` delicate parts of the clutch serving to protect the same and preventing the entrance of dust or foreign matter to interfere with the proper operation thereof.

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. '1, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the ap ended claims.

Having described my invention what 1 claim as new and desire to secure by Letters Patent is: y

1. A friction clutch'comprising a rotary cylindrical element; a rotary circular member loosely mounted upon said cylindrical element, said circular member having an internal circular friction surface; a split expansion band mounted upon said cylindrcal element, and adapted, when expanded, to frictionally engage said friction surl face; a pair of oscillatory levers also mounti,1 imac ed upon said cylindrical element for cooperation with the ends of said band; a

wedge member; guide studs slidably mount- .Said band, substantially as described.

2. A friction clutch comprising a rotary cylindrical element; a rotary circular mem- `ber loosely mounted upon said cylindrical element, said circular member having an internal circular friction surface; a split ex- 'pansion band mounted upon said cylindrical element and adapted, when expanded, to frictionally engage said friction surface; a

'y air of oscillatory levers also mounted upon said cylindrical `element for coperation with the ends of said band; a roller adapted to be moved into and out of registration with corresponding ends of said levers for rocking the latter to expand said band; a pair. of guide pins for supporting said roller, said guide pins being slidably mounted in said cylindrical element; and means engaging with said pins for manually ad-,

justiug said roller, substantially as' described.

3. A friction clutch comprising a rotary cylindrical element; a rotary circular member loosely mounted upon .said cylindrical element, said circular member having an internal circular friction surface; a split expansion band mounted upon saidl cylindrical element and adapted, when expanded, to frictionally engage said friction surface; a pair of oscillatory levers pivotally con nected intermediate their ends with the terminals of said band; a loosely mounted ful- `crum member with opposite sides of which corresponding ends of said levers are adapted to contact so that, when the opposite ends of said levers are spread said band .will be expanded; a screw adjustably mounted in one side of said fulcrum member for contact with one of said levers; and means adapted to be moved into and out of registration with said levers to spread the same, substantially as described. v l

41. A friction clutch comprising a rotary cylindrical element; a rotary circular memh ber loosely mounted upon said cylindrical 'said band substantially midway its en s,

and a pair ofbolts passing throu ht the portions. of said band between sai said last mentioned bolts engaging elongate slots provided in said band to permit of llirst. mentioned bolt and the ends of rsaid bandt flexing of the ends thereof; and means for outwardly flexing said ends to expand said band, substantially as described.

5. A friction clutch comprising'a rotary hollow circular member open at one end; a.

rotary c lindrical member loosely mounted in said rst mentioned member and closing said end thereof so as to forman inclosed chamber Within said member at the opposite end of the latter an annular collar secured within said circular member; a shoulder on `said cylindrical member engaging against one side of said collar to lock said parts against Irelative longitudinal movement in one direction, saidA circular member having an internal circular friction surface; a split expansion band mounted upon said lcylin- `drical member Within said chamber and cylindrical member engaging' one side of -1 said collar to lock said parts against relative longitudinal movement in one direction, said circular member having an internal circular friction surface; a split expansion bandy mounted upon said cylindrical member adapted, when expanded, to frictionallyengage said friction surface, said expansion band contacting with the other side of said collar to lock said parts against relative longitudinal movement in the opposite direction; and means for expanding said band, substantially as described.

y7. A friction -clutch comprising a rotary cylindrical element; a rotary circular member loosely mounted upon saidcylindi-ical element, vsaid circular'meniber having an internal circular friction surface; a split expansion band mounted upon said cylindrical element and adapted, when expanded, to frictionally engage said friction surface; a

- securing device passing through said band substantially midway its ends; a pair of securing devices passing through the portions of said band, between said irst' mentioned securing device and' the ends of said band,

said last mentioned securing devices engaging elongated slots provided in said band to permit of flexing of the ends thereof; and means for outwardly fiexing s'aid ends to expand said band, substantially as described.

In testimony whereof l have signed my name to this specification iii the presence of two subscribing witnesses.

ALBERT H. .(irLllSON.

W'itnesses: v

F. M. OCONNOR, lV. M. BUuirn. 

